3.9=7.5-0.4x

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Solution for 3.9=7.5-0.4x equation: 



3.9=7.5-0.4x

We move all terms to the left:

3.9-(7.5-0.4x)=0

We add all the numbers together, and all the variables

-(-0.4x+7.5)+3.9=0

We get rid of parentheses

0.4x-7.5+3.9=0

We add all the numbers together, and all the variables

0.4x-3.6=0

We move all terms containing x to the left, all other terms to the right

0.4x=3.6

x=3.6/0.4

x=9

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